Self-calibrated constant-gain tunable oscillator

Details Self-calibrated constant-gain tunable oscillator Self-calibrated constant-gain tunable oscillator

2003-05-30

2008-11-25

Pascal, Robert J. (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S011000, C331S044000

Reexamination Certificate

active

07456694

ABSTRACT:
The present invention provides a tunable oscillator. A voltage-to-current converter receives as input a voltage from a phase-locked loop and outputs a first current. A current-controlled oscillator receives the first current and outputs a frequency responsive to the voltage. A second current is input into the current-controlled oscillator to adjust the gain of the current-controlled oscillator. A third current is input into the voltage-to-current converter to adjust the first current and the gain of the voltage-to-current converter. The second and third current values are set using a two-stage pre-calibration method. During the pre-calibration, a control circuit adjusts and then sets the second and third currents so that the output frequency spans a lock-in frequency range required by the phase-locked-loop over a voltage range spanning voltage tolerance of a loop capacitor of the phase-locked-loop.

REFERENCES:
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patent: 6870411 (2005-03-01), Shibahara et al.
patent: 2003/0042985 (2003-03-01), Shibahara et al.
patent: 2003078410 (2003-03-01), None

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